diaphragm type check valve ( Figure 2 - 58 and figure 2 59) The closed system composed of diaphragm, the diaphragm and seat deviation or joint.

FIG. 2 58 as shown in the check valve has a conical perforated basket shape parts, the internal parts for matching the bearing of the diaphragm. The valve in the line between the two flanges, or clamped between the pipe joint. Through a conical body fluid will be lifted from its seat, diaphragm medium by then. When downstream a stop, the diaphragm will restore its original shape, closed very quickly. Worth a mention in the use of occasions as input to the processing pulp and purification of colloidal medium pipeline gas pipe. On this occasion, the diaphragm shows great operation reliability, if use other valves, it will soon be wear and tear.

FIG. 2 59 shown in check valve adopts the fold of annular rubber diaphragm. The valve is closed, the diaphragm fold edge joint in the center of the media channels. Open fold membrane in downstream medium so as to edge of the diaphragm from the seat back. Because the diaphragm in the open position for the elastic taut state, and the displacement of the diaphragm edge from open to closed position is very short, so this kind of diaphragm Industrial Valves shut up very quickly. The diaphragm type check Industrial Valves is suitable for medium flow range great occasions. But, in might use the occasion of this valve, pressure differential is limited to 1 mpa, using temperature to 70 ℃.

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